Actually I am a Broker/Realtor, go figure, huh? lol
The answer to your question is - YES.
The property becomes known as a "stigmatized property".
In some states, the Realtor, can not tell the buyer this information unless they specifically ask. In others the Realtor MUST disclose this information - for one, because some religions prohibit the living in a home where a death occurred.
If the buyer is working with a Realtor who is acting on their behalf, a buyers agent, then the Realtor, no matter what state, MUST disclose this information or they could lose their license.
Believe me, it has happened more than a few times, they buyer signs the offer to purchase and before closing, talks to the neighbors, and then you are worse off.